Official Mathlib source

Finset.inclusion_exclusion_card_biUnion

This declaration comes from Mathlib. Follow the official immutable link below to inspect the exact upstream source; ProofAtlas does not mirror or claim authorship of it.

Exact upstream reference

Package: mathlib
Repository: https://github.com/leanprover-community/mathlib4
Commit: 5e932f97dd25535344f80f9dd8da3aab83df0fe6
Source path: Mathlib/Combinatorics/Enumerative/InclusionExclusion.lean:153
SHA-256: sha256:fe311ef00fbd82eac7832b308b04d5054edee2cec0ba25a6bf60abeb68918f9b
Verified bytes: 9,025

Open source in Mathlib

Why there is no source download here

ProofAtlas links to the official immutable Mathlib source. It does not mirror the Lean file, relicense upstream work, publish a ProofAtlas source archive, or claim a first-party source footprint.